I'm trying to find Piston A std, according to the stamp on the block: BBBA, for my stock build. Cuz my no. 4 cylinder has a bent rod. Problem is though no one has piston A std only piston B std for an H23. So, my question is, can I use piston B instead without any milling/boring?
Thank you.

 

i dont know much about the h23 but i know that the h22 has an 87 and 87.25mm piston size ( A and B ). hopefully someone else will know alittle more and chime in.

 

Anyone?

 

Just check your clearances, it would be better if it was the other way around though. The "B" size is a tad bigger than the "A" size, so your piston to wall might be a bit tight if you put a "B" slug into an "A" cylinder. And the A & B size do not refer to 87 or 87.25 (oversized) pistons, they are only different by a couple hundredths or thousandths of a mm, iirc.

I'm assuming you're trying to build this on a budget, but if you're really worried about it you can always pick up one brand new piston, I think they're around $100.

 

Actually, I'm trying to get piston A from Honda but they can only source me a piston B. Also, I'm on a budget for this rebuild.